Kentuckians who want to switch political parties and vote as Republicans or Democrats in next May's primary have until December 31st to do so. Voters will be choosing Republican and Democratic nominees for a variety of local government positions, plus judicial seats, legislative posts, and, at the top of the ticket, a U.S. Senate seat. Republican Senator Mitch McConnell, seeking re-election to a sixth term, faces a GOP challenge from Louisville businessman Matt Bevin. Democratic front-runner Alison Lundergan Grimes also has a primary, but neither of her opponents is considered a serious threat. According to state law, people who change parties after January 1st will be allowed only a nonpartisan ballot in the May primary.